Page 



13. Distribution and abundance of the diatom, Rhizosolenia sp. around 

 Oahu, August 1-6, 1956 (HMS-35) 17 



14. Stations for collecting zooplankton for monitor series. Semimonthly 

 collections were made at stations 1 and 3 for the inshore-offshore 

 series 17 



15. Average adjusted volumes of zooplankton (points) +1 standard devia- 

 tion (vertical lines) for the monitor series, 1956 18 



16. Adjusted volumes of zooplankton for the inshore and offshore stations, 

 1956 18 



17. Hydrographic stations at which zooplankton was collected on HMS-34 19 



18. Average volumes of zooplankton by cruise for each month in which 

 samples were collected, July 1951 to June 1956. Number of samples 

 is shown in parentheses. (Data for 1951-54 from fig. 7 in King and 

 Hida, 1957.) 19 



TABLES 



1. A list of the ships, cruises, and dates on which samples of zooplankton 

 were collected 2 



2. Comparison of night/day ratios of unadjusted and adjusted volumes of 

 zooplankton - 3 



3. Average corrected sampling depths of the nets used in three-net hauls 3 



4. Average volumes of zooplankton from three-net hauls on HMS-32, 34, 



and 35, and from two-net hauls on HMS-36 5 



5. Average ratios of volume of zooplankton in various strata of water 

 sampled by three nets on HMS-32, 34, and 35, and by two nets on 

 HMS-36 5 



6. Average volumes of zooplankton in two strata of water during different 

 periods of the day on CHG-24 5 



7. Comparison of average volumes of zooplankton (cc. per 1,000 m.'^) 

 between windward and leeward areas off Oahu for the upper, middle, 

 and lower nets of the Smith cruises. 1956 /n = number of samples; 

 X = average volume; s = standard deviation; t = statistic for testing 

 hypothesis; P = probabilityy 6 



Analysis of variance of adjusted volumes of zooplankton (cc. per 

 1,000 m."^) in different seasons for the upper net of the Smith cruises 

 /n = number of samples; x = average volume; s = standard deviation; 

 F = statistic for testing hypothesis; P = probability/ 



9. Percentage composition and average number of organisms per 

 1,000 m."^ of water strained by the upper net on the Smith cruises and 

 by the net towed between the surface and the top of the thermocline on 

 CHG-24 8 



10. Percentage composition and average number of organisms per 

 1,000 m."^ of water strained by the middle net on the Smith cruises 9 



11. Percentage composition and average number of organisms per 

 1,000 m."^ of water strained by the lower net on the Smith cruises 10 



12. Ranks for average numbers of organisms per 1,000 m.3 of water 

 strained by the different nets on the Smith cruises. (The layer-- 

 upper, middle, lower--in which organism was most numerous is 

 indicated by rank 1, and least numerous by rank 3.) 10 



13. Comparison of average number of organisms per 1,000 m."^ of water 

 strained by the upper net in windward and leeward areas (number of 

 samples shown in parentheses) ^11 



